Question

How many possible values for y are there where y= Cos -1 0

A.) 0
B.) 1
C.) infinite
D.) 2

Answer 1

B) 1 possible value

FOR THIS SPECIFIC INSTANCE

Explanation:

If it is Cos -1 (0) and cos is capitalized, that means it is a function and you apply restrictions. Based on the restrictions you get one possible value (I think the value is pi/2)

However, if the problem is cos -1(0) with no capitalization, it is a relation meaning values are infinite because of repetitions. The answers would be pi/2 and 3pi/2 and both would be added/subtracted by 2n(pi).